docs: update readme (#120)

README.md

@@ -59,13 +59,31 @@ See the [official docs](https://github.com/home-assistant/addons/blob/master/mos
 
 I recommend you use the existing Grafana addon from the community addons, if you do, please enable the following plugins in your yaml configurations, e.g.
 
+> Make sure you edit the configuration in YAML mode, not the GUI mode.
+
 ```yaml
 plugins:
-  - natel-discrete-panel
-  - pr0ps-trackmap-panel
-  - grafana-piechart-panel
+  - name: natel-discrete-panel
+  - name: natel-plotly-panel
+  - name: pr0ps-trackmap-panel
+  - name: grafana-piechart-panel
+  - name: panodata-map-panel
+    url: https://github.com/panodata/panodata-map-panel/releases/download/0.16.0/panodata-map-panel-0.16.0.zip
+custom_plugins: []
+env_vars:
+  - name: GF_SECURITY_ADMIN_USER
+    value: <youruser>
+  - name: GF_SECURITY_ADMIN_PASSWORD
+    value: <yourpass>
+  - name: GF_PLUGINS_ALLOW_LOADING_UNSIGNED_PLUGINS
+    value: panodata-map-panel
+ssl: true                 # optional if you are using TLS
+certfile: fullchain.pem    # optional if you are using TLS
+keyfile: privkey.pem       # optional if you are using TLS
 ```
 
+> Note that the security admin password and usernames can only be set on the first start of the Grafana addon, so if you already have it configured you'll need to remove it and re-add it.
+
 #### Data Source
 
 Configure a PostgreSQL data source as follows: